Wood-screw.



I. L. MESSENGER.

WOOD SCREW.

APPLIGATIDH mum mm: 20, 1910.

1,000,280. Patented Aug. 8, 1911.

ainllilllulllnmlyiumunnlnnlu WIT/V5883: "WEN-TOR I 15mm? Lflwmyar M By ' i ATTORNEYS v UNITED STATES PATENT OFFICE.

ISAIAH LEWIS MESSENGER, OF DE RUYTER, NEW YORK, ASSIGN'OR OF ONE-HALF TO B. DE WITT BURDICK AND ONE-EIGHTH TO IRWIN H. 'BABCOCK, OF DE BUYTER,

NEW YORK.

WOOD-SCREW.

Specification of Letters Patent. Patented Aug. 8, 1911.

Application filed June 20, 1919. Serial No. 567,856.

To all whom it concern:

Be it known that I, ISAIAH L'. MESSENGER, a citizen of the United States, and a resident of De Ruyter, in the county of Madison and State of New York, have invented a new and Improved Wood-Screw, ofwhich the following is a full, cle'ar, and exact description.

Among the principal objects which the present invention 'has in view are to provide a screw of the character described, the weight whereof is diminished without impairment of the strength; to provide a screw the threads whereof are sectioned to form a plurality of cut-ting edges for the threads and a relief passage in the barrel of the screw; to provide a screw of the character; set forth, the head whereof permits the useof a counter-sinking driver; and to provide a screw of the character set forth the construction whereof is economical, efficient-and durable.

One embodiment of the present invention is disclosed in the structureillustrated in the accompanving drawings, in which like characters of reference denote corresponding parts in all the views, and in which Figure 1 is a side elevation, on a magni-.

fied Scale, showing a wood screw constructed and arranged inaccordance with the .present invention; Fig. 2 is'a top view of'the head of ascrew so constructed; Fig. 3 is" a cross section of the'same taken on the line 33 in Fig. 1; and Fig. 4: is a detail view. on an enlarged scale, of the screw, showing a counter-sunk driver in conjunction therewith.

A wood screw, constructed in accordance with the present invention, differs from the ordinary screw in that the opposite sides thereof and longitudinally'disposed thereon,

are formed channels 5, 5. The channels 5,

5 are constructed to as large dimensions as consistent with the holding purpose of the screw. The larger the channels the lighter the screws. In some instances the wire from which the screws are made when thus constructed is rolled to have formed therein the channels 5, With wire thus formed -a preferred method ofproducing the screw threads is to roll the same in die plates adapted to form the threads. By thus forming the threads in half sections it will be seen. thatthe edge of the thread adjacent to the channels 5, constitutes each Section a cutting edge adapted to sink or drive into the wood structure as the screwis turned. Further, it will be seen that by reason of the interposed channels 5, 5 a small proportion of the wood which in the ordinary screw would follow the pitch of the thread, is missed by the thread, and the cutting edge of the succeeding section of'thread sh'aves the wood in making a. path for the said succeeding thread sections. This shaving is delivered into the channel 5 at the end of the section which is cut. the channels 5, 5

forming throat or'relief passages for the shavings thus accumulated, and so relieving the frictional tension of the wood on the threads and barrel of the screw. The channels 5, 5 are extended through the head A of the screw and meet the saw-cut B, as shown in the drawings. By forming the channels 5, 5 in the head in the manner described there is provided a means for the introduction of the cutting edge C of the driver blade D below the inclined Wall E of the head A. The cutting edge C of the driver D is sharpened to form a boring tool to ream a hole in'the wood in advance of the head A'to seat the said hea in the wood by the one and same op tion whereby the said screw is driven. x

With a screw thus constructed it is obvious that the saving in weight is material. In practice I find that I can save at least 25% of the total bulk weight in screws thus constructed. This saving in freightmates results-in an advantageto screws of this character. It will also be seen that in the operation of driving, where it is desired to" .ream out the counter-sink for the head A.

the screw thus constructed permits the use of the special tool desi ned for this purpose, which tool may be operated simultaneously with the driving of the screw. By reason of the shave of the sides of the cut of the screw the preliminary dulling is obviated. Each thread thus shaves a minute but sufficient portion of the wood which is de-' livered upward through the channels 5.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is A wood screw having a groove extending across its head for the reception of a screw driver and provided with straight longitud nally extending grooves in diametrically,

- oppositesides of its body, said grooves being of. the same size as the groove of the head specification in the presence of two s1 1band leadfing liaherefrom to the pointjof tlae scribing witnesses.

screw,w ere a. continuous assa eex'ten ing from the point on one side Ecrossthe ISAIAH LEWIS MESSENGER 5 head and to the point on the opposite side, Witnesses:

is formed'in the screw. HIRAM D. MESSENGER,

-In testimony whereof I have signed this I HENRY A. BORGELDT. 

